Simple Block Swap

Replaces all Granite with Deepslate.

{
  "inputs": ["minecraft:granite"],
  "output": "minecraft:deepslate"
}

Removing Blocks

Removes all Bedrock from the world.

{
  "inputs": ["minecraft:bedrock"],
  "remove": true
}

Mod ID Wildcard

Replaces all blocks from examplemod with minecraft:stone. This is useful if you remove a mod but want to keep the world geometry intact.

{
  "inputs": ["examplemod:*"],
  "output": "minecraft:stone"
}

Biome Specific

Replaces Grass Blocks with Sand, but only in Plains biomes.

{
  "inputs": ["minecraft:grass_block"],
  "output": "minecraft:sand",
  "biomes": ["minecraft:plains"]
}